do I need FRICTION MODIFIER in my AA 3:73??

[BBowers]

I have a 2005 3500 drw with 3:73 limited slip, 4x4, CTD. Auto!! I am wondering if I need to add friction modifier to the axle fluid front or rear with the stock American Axle setups. I am converting over to Amsoil severe gear 75w90. The oil change place said I need to use 75w140 for serious towing but i told him "show me in the manual!" He couldn't, of course. Does anybody know what the fluid capacity is on the front axle? Can I change it myself with out a torque wrench? any particular tightening sequence?

 

[JApol]

I just put in the same oil you bought, 30 ft-lbs is the tq which is easily attainable by hand. The manual says that no modifiers are necessary. I think Testraub and I put 3 qts in front and 4 in back. Just watch all those steering rods, they are murder on the knuckles

 

[BHanna]

No modifier needed in either the front or rear. Just use good synthetic lube. For heavy towing, I think some people are using 75w140. Owner's manual says 75w90 I think. Either is probably ok if changed at the specified 15000 miles. Most people go way more than 15000 miles between changes.

 

[klenger]

75W90 100% synthetic is the only approved fluid recommened for all uses, including heaving towing. There was a misprint of a TSB on dodgeram.org that showed 75W140, but it was in error. No firiction modifier needed.

 

[JThiessen]

So has anybody noticed slippage after converting to the amsoil (or equivelent)? I did. I never felt it prior to changing the fluid, now I get almost everytime I go around the corner.

 

[DWestfall]

I switched to Amsoil and was misdirected to add friction modifier. Which I did. Now it is a rare occasion when I spin both wheels. One wheel peel stinks!

 

[jwilliams3]

30 ft lbs if you want to break the bolt heads off in the diff housing.



18-20 is plenty.

 

[Phil Howell]

The Tracrite used in our AAM rearends is a helical gear limited slip. It's exactly the same design as a Detroit Truetrac, only with a 2:1 torque bias instead of the Truetrac's 3:1 bias. All that means is the Truetrac is a bit more positive than ours. Neither one of these LS units have clutches, so no friction modifier is required. We shouldn't notice a difference if friction modifier is mistakenly added.



IMO, the Tracrite used in our 3rd-Gen Dodges is the best factory limited slip we can get anywhere.

 

[amsoilman]

The Tracrite used in our AAM rearends is a helical gear limited slip. It's exactly the same design as a Detroit Truetrac, only with a 2:1 torque bias instead of the Truetrac's 3:1 bias. All that means is the Truetrac is a bit more positive than ours. Neither one of these LS units have clutches, so no friction modifier is required. We shouldn't notice a difference if friction modifier is mistakenly added.



IMO, the Tracrite used in our 3rd-Gen Dodges is the best factory limited slip we can get anywhere.

I agree... ... ... ... ... ... ... ... ... ... ... . NO FRICTION MODIFIER needed in the AAM Axles used in the 03 and up in the CTD trucks!



Wayne

amsoilman